Support to specify Ofdpa extension through REST API

Code clean up for Nicira extension codec.

Change-Id: Idbbfd1ca12b01d46e3b6c90ebce39e6a6605cb58
diff --git a/drivers/default/src/main/java/org/onosproject/driver/extensions/codec/NiciraMatchNshSpiCodec.java b/drivers/default/src/main/java/org/onosproject/driver/extensions/codec/NiciraMatchNshSpiCodec.java
index 150125a..398a21e 100644
--- a/drivers/default/src/main/java/org/onosproject/driver/extensions/codec/NiciraMatchNshSpiCodec.java
+++ b/drivers/default/src/main/java/org/onosproject/driver/extensions/codec/NiciraMatchNshSpiCodec.java
@@ -52,8 +52,6 @@
                 NSH_PATH_ID + MISSING_MEMBER_MESSAGE).asInt();
         NshServicePathId nshSpi = NshServicePathId.of(nshSpiInt);
 
-        NiciraMatchNshSpi niciraMatchNshSpi = new NiciraMatchNshSpi(nshSpi);
-
-        return niciraMatchNshSpi;
+        return new NiciraMatchNshSpi(nshSpi);
     }
 }